[compiz] re-work option initialization

[Danny Baumann]

Hi,

> I think in the long term, the autogenerated settings managers
> will be replaced with hard coded user friendly ones, this will
> leave all of these extra attributes with nowhere to go.

I disagree. There are different usage models, reflected best by having
different settings managers. Beginner users may want an
as-simple-as-possible settings manager (such as desktop-effects),
average users may want a settings manager which provides some more
settings (such as gnome-compiz-manager), and there may be power users
which want to tweak every single option in a Beryl settings manager
style application.
When discussing things like storing option descriptions and grouping we
should think of _all_ possible user groups, not only our preferred usage
model. Settings managers are free to ignore option information provided
by the plugin (or whatever format), while it's not possible to create
such information when it's simply not available.

Regards,

Danny